Pressure Pipe Drilling With Sheath Sealing for Leak Prevention
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Solution Overview
Problem
Existing methods for pressure pipe drilling on cement-mortar lined and coated steel cylinders face challenges such as corrosion and loss of water tightness due to physico-chemical reactions when drilling under pressure, leading to potential leakage issues.
Innovation Solution
A method involving internal lining with a fluid-tight sheath, drilling to expose the interior layer, injecting a sealant into the first cavity, and then drilling a second cavity through the sealed interior layer and sheath to maintain water tightness, using a specialized injector to ensure complete sealing and prevent leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hot tapping is performed on cement-mortar lined and coated steel pipes, then the system remains under pressure and water servicing continues, but corrosion issues and loss of water tightness occur at the tap-pipe connection
Solution Approach 1:
The drilling process is divided into two separate operations: first drilling through the exterior layers to expose the interior layer, then after sealant injection, drilling a second cavity through the sealed interior layer and sheath. This segmentation allows the sealing step to be performed between drilling operations, preventing corrosion and maintaining water tightness while enabling continuous water servicing.
Solution Approach 2:
A fluid-tight sheath is installed internally in the pipe before the drilling operation begins. This preliminary protective measure ensures that when drilling occurs, the sheath is already in place to prevent corrosion and maintain water tightness, allowing the system to remain under pressure throughout the operation.
2Ease of operation
If drilling is performed through cement-mortar lined and coated steel pipes, then access to the pipe interior is achieved, but corrosion and leakage occur due to physico-chemical reactions
Solution Approach 1:
A sealant is introduced as an intermediary substance injected into the first cavity formed during drilling. This sealant coats the interior layer and prevents direct contact between the drilling equipment and the cement-mortar lining, thereby preventing corrosion and physico-chemical reactions while still allowing access to the pipe interior.
Solution Approach 2:
A fluid-tight sheath is installed internally in the pipe before drilling. This thin film structure provides a protective barrier that prevents corrosion and leakage at the drill hole while allowing the drilling operation to proceed. The sheath flexes to accommodate the drilling process while maintaining its protective function.
3Productivity
If a single drilling operation is performed, then the process is simple and quick, but water tightness is compromised due to exposure of internal layers
Solution Approach 1:
The drilling operation is segmented into two distinct phases: first drilling through the exterior coating and steel cylinder to expose the interior layer, then after sealant injection, drilling a second cavity through the sealed interior layer and sheath. This segmentation maintains water tightness while managing the complexity of the process.
Solution Approach 2:
The interior layer is sealed with sealant and a fluid-tight sheath is installed before the second drilling operation. This preliminary sealing action ensures that when the second cavity is drilled, water tightness is maintained, resolving the contradiction between drilling efficiency and reliability.
Data Source
AI summary
A method for pressure pipe drilling a pipe comprising an exterior layer and an interior layer, the method comprising internally lining the pipe with a fluid-tight sheath; drilling a first cavity through the exterior layer until exposing the interior layer; injecting a sealant into the first cavity; and drilling a second cavity within the first cavity through the interior layer and the fluid-tight sheath.